脉冲涡流检测提离效应的抑制方法

吴少文; 付跃文

脉冲涡流检测提离效应的抑制方法

南昌航空大学无损检测技术教育部重点实验室，南昌330063

基金项目:

国家自然科学基金资助项目(51267016)

详细信息

作者简介:
吴少文(1989-)，男，硕士研究生，主要从事电磁无损检测技术研究，无损检测仪器开发工作。

中图分类号: TG115.28，TB302.5
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出版历程
- 收稿日期: 2013-07-10
- 刊出日期: 2014-04-09

Reduction of Lift-off Effects to Pulsed Eddy Current Testing

摘要

摘要: 脉冲涡流检测中由于探头倾斜或被测对象表面不光滑等原因容易产生提离效应,提离效应严重影响着脉冲涡流无损检测的结果。提出了一种基于差分信号二阶微分零时刻值匹配补偿的方法。首先建立相应的提离参考数据库，然后通过索引二阶微分零时刻值匹配提离参考信号，计算补偿比，利用补偿公式对提离效应进行抑制。通过试验发现，经该方法处理后的有提离差分信号能够与无提离的差分信号可以很好的吻合，消除了提离效应对差分信号的影响。试验结果表明了该方法能够对多层金属结构的内部缺陷检测具有较好的提离抑制效果。
- 提离效应 /
- 脉冲涡流 /
- 二阶微分
Abstract: Pulsed eddy current testing(PEC) is susceptible to lift-off effect because of the probe inclination or irregular sample surface, which has serious influence on the result of pulsed eddy current testing. A new technique to reduce lift-off effect based on second-order differential at starting point is proposed. The first thing is to build a lift-off reference database first, and afterwards to determine the lift-off value of experimental signals in the inspection by indexing second-order differential value at starting point in the lift-off reference database. Then the compensation ratio is calculated and a compensation formula is used to suppress the lift-off effect. After being processed by proposed method, the differential signals with lift-off noise agree well with the differential signals without lift-off noise. Experimental results show that the lift-off effect has been significantly reduced by using this method in internal defect detection of multi-layer metal structure with pulsed eddy current method.
- Lift-off effect /
- Pulsed eddy current /
- Second-order differential

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参考文献(10)

[1]	GIGURE S, LEPINE B A, DUBOIS J M S. Pulsed eddy-current(PEC) characterization of material loss in multi-layer structures［J］. Canadian Aeronautics and Space Journal,2000,46(4):204-208.
[2]	闫向阳，周德强，左晓芳，等.脉冲涡流矩形传感器参数仿真优化设计［J］.失效分析与预防,2013,8(1):6-9.
[3]	MOULDER J C, BIEBER J A. Pulsed eddy current measurements of corrosion and cracking in aging aircraft ［C］// Materials Research Society Symposium Proceedings of Nondestructive Characterization of Materials in Aging Systems,1998,503:263-268.
[4]	PLOTNIKOV Y A, BANTZ W J, HANSEN J P. Enhanced corrosion detection in airframe structures using pulsed eddy current and advanced processing［J］. Materials Evaluation,2007,65(4):403-410.
[5]	MURNER C, John P. Hansen. Buried corrosion detection in multi-layer airframe structures using pulsed eddy current［C］// 17th Word Conference on Nondestructive Testing, Shanghai, China, Oct.2008,25-28.
[6]	TIAN G Y, SOPHIAN A. Reduction of lift-off efects for pulsed eddy current NDT［J］. NDT & E International,2005,38:319-324.
[7]	Giguere Sylvain, LEPINE B A, DUBOIS J M S. Pulsed eddy current-finding corrosion independently of transducer lift-off［J］. Review of Progress on Quantitative Nondestructive Evaluation,2000:449-156.
[8]	Qiao Joanna X, JOHN P, et al. Automatic differential lift-off compensation(AD-LOC) method in pulsed eddy current inspection［C］// 17th Word Conference on Nondestructive Testing, Shanghai, China, Oct.2008,25-28.
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脉冲涡流检测提离效应的抑制方法

作者简介: 吴少文(1989-)，男，硕士研究生，主要从事电磁无损检测技术研究，无损检测仪器开发工作。

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出版历程

Reduction of Lift-off Effects to Pulsed Eddy Current Testing

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出版历程

目录

作者简介:
吴少文(1989-)，男，硕士研究生，主要从事电磁无损检测技术研究，无损检测仪器开发工作。